Collateral Cavity Electromagnetic Propulsion Guns

ABSTRACT

Narrow collateral cavity electromagnetic guns with two wall conductor assemblies with a divide plane proximal barrel bus and array of wall conductors extending therefrom to contact means proximal the half cavity&#39;s narrow wall in each collateral cavity half, like potential power rails at the narrow walls and a midline power rail in a wall there between. Each collateral half of projectiles for use therein have: a propulsion bus orthogonal the cavity&#39;s axis continuous the said midline power rail at one end and propulsion bus-aft shunt current bus the other, and forward and aft current shunts on both sides of the projectile&#39;s collateral halves. Projectile&#39;s current buses co-act with said assembles, shunts and power rails circulating the gun&#39;s current around both sides of the propulsion buses and the magnet fields of said circuit interact with the propulsion buses&#39; currents creating forces therein propelling the projectile through the barrel cavity.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of patent application Ser. No. 10/707,607 filed Dec. 24, 2003 and claims the benefit of the filing dates of provisional patent application 60/319,820 filed Dec. 30, 2002, provisional patent application 60/320,208 filed May 21, 2003, and provisional patent application 60/481,159. This application is also related to sister divisional application Ser. No. 11/164,727 filed Dec. 2, 2005 and sister divisional application Ser. No. 11 /306,245 filed Dec. 20, 2005.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The following invention is related electromagnetic propulsion devices such as rail guns. In rail guns a magnetic field perpendicular to an electrical current path through an armature, interacts with the path current, creating force on the armature which is perpendicular to both the current path and the magnetic field. The armature of a rail gun is located between and has electrical continuity with the gun's parallel power rails. In the rail gun, armature current flow is resultant a voltage potential between the power rails.

2. Description of Related Art

The source of the armature accelerating magnetic fields in a rail gun is often only its very large rail currents. Among the oldest patented rail gun inventions are those of Fauhon-Villeplee which include U.S. Pat. No. 1,370,200. The Fauhon-Villeplee devices have, in addition to the magnetic fields of the rail currents, magnetic fields for armature acceleration supplied by electromagnets and/or permanent magnets arranged along the armature's path between the power rails. The power rails primary function is the supply of armature current. These devices, although more cumbersome, permits more latitude in accelerator design.

Pyrotechnic projectile acceleration means such as gun powders and more esoteric explosives pervasive civilian and military armaments today have upper projectile velocity limits. These upper velocity limits are determined by the molecular velocity of the projectile propelling explosion gases at the maximum pressure and temperature permitted in the barrel. Rail guns do not share this limitation. Therefore, the massive power generation and distribution systems, which can include cryogenic equipment, to meet the immense electric currents requirements of rail guns propelling projectiles to hyper velocities are seen as acceptable overhead.

With the effective development of gas cartridge fired power sources similar to those used for emergency power in some commercial and military aircraft, a significant reduction in the mass of rail gun support equipment should be possible.

The equations and examples herein are intended as aides to practitioners of the arts relevant to the topic devices and are not part of the claimed devices, and the degree of their veracity is not intended to reflect adversely on the veracity, spirit, intent, merit or scope of this application for letters of patent.

A simplified equation for the increment of force due to one rail in a rail gun is: 1) df=dq(U×B)=(dQ·dl/dt×B)=I dl×B=I dl×μI/(2πr), where μ=4π×10⁻⁷ H/m. The force on the armature due to the current in both rails is then: $\begin{matrix} \begin{matrix} {{Force} = {{2\left\lbrack {I^{2}\left( {4\pi \times 10^{- 7}} \right)} \right\rbrack}{\int_{r_{o}}^{r_{1}}\quad{{\mathbb{d}r}/\left( {2\pi\quad r} \right)}}}} \\ {= {{I^{2}\left( {4 \times 10^{- 7}} \right)}{\ln\left( {r_{a}/r_{o}} \right)}\quad{Newton}}} \end{matrix} & \left. 2 \right) \end{matrix}$ where r_(o) is effective radius of one of the rails and r_(a) is the straight line distance from that rail to the second rail.

The following example illustrates the magnitude of the currents required by conventional rail guns.

A hypothetical gun with a 11.43 mm cylindrical bore (0.45 inches) and an approximate 0.6264 m (24 inches) barrel length, fires a 6.48 gram (100 grain) bullet with muzzle velocity of 1524 m/s (5000 ft/s). Ignoring air and barrel friction, a like muzzle velocity would also result from a steady force of 12344.2 N (2775 lbf) applied to the bullet during its 0.0008 second barrel traverse. At the muzzle the bullet has 7525 J (5550 ft-lbf) kinetic energy.

Applying equation 2, above, for the rail gun force (with an r_(a)/r_(o) ratio of 5.4) for like performance of a 0.6264 m (24 inches) long rail gun propelled bullet and ignoring air and barrel friction and circuit losses, a current of approximately 135,065 Amperes at a rail potential of 69.6 Volts is required to produce the 12344.2 N force on the armature for the 0.8 millisecond barrel traverse time.

For a like performance in a rail gun that has a 0.6264 m long barrel (24 inches) cavity with a rectangular right section and a r_(a)/r_(o) ratio of 15, propelling a 6.48 gram (100 grain) flat projectile with a 0.0422 m (1.66 inches) long propulsion bus, an approximate current of 106,751 Amperes at a rail potential of 88.1 volts is required to produce the 12344.2 Newton (2775 lbf) force on the armature for its 0.0008 second barrel traverse.

BRIEF SUMMARY OF THE INVENTION

The armatures of the topic inventions herein are referred to as projectiles. In a projectile of the topic invention, there is a propulsion bus-aft shunt current bus between the propulsion bus and the second aft current shunt and an aft shunt-forward shunt current bus between the first aft current shunt and the second forward current shunt in each half of said projectile's collateral halves.

When one or both of above said current buses are extant in rail guns with non-collateral projectiles and barrel cavities, the currents in each current bus is parallel to the current's direction in the proximal power rail and there are large forces of attraction of each said current bus towards the proximal power rail which creates large frictional forces on the projectile opposing its barrel cavity's traverse.

The collateral barrel cavity of the topic invention and the projectiles used therein eliminate the above said losses due to friction by utilizing like, but oppositely directed forces of attraction between the current buses in each collateral half of a projectile and their proximal power rail which cancel each other and the need of additional barrel rails and their attendant sliding continuities to avoid said loss generating force is eliminated.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a oblique view of the breech end of a shortened gun of the Invention with a projectile;

FIG. 2 is a oblique view of the gun in FIG. 1 shortened and disassembled;

FIG. 3 is an oblique sectioned partially cut away view of the second side of the gun in FIG. 1;

FIG. 4 is an enlarged view of box ‘A’ in FIG. 3;

FIG. 5 is an enlarged view of box ‘B’ in FIG. 3;

FIG. 6 is an oblique view of the first side of a collateral projectile for the gun in FIG. 1;

FIG. 7 is an oblique view of the second side of a collateral projectile for the

FIG. 8 is an oblique view of the collateral projectile in FIG. 7, disassembled;

FIG. 9 is an oblique cutaway view of the first side of the first collateral half of the gun in FIG. 1 to illustrate the current path;

FIG. 10 is an oblique cutaway view of the second side of the first collateral half of the gun in FIG. 1 to illustrate the current path;

FIG. 11 is an oblique cut-a-way of a projectile retained by a fuse pin at the gun's breech;

DETAILED DESCRIPTION OF THE INVENTION

Devices of this invention are electromagnetic propulsion guns that have a barrel with a narrow cavity, the barrel cavity, extending there through. The barrel cavity has a breech end opening at one barrel end and a muzzle end opening at the other barrel end and a central axis extending said cavity's length which is parallel to the cavity's surfaces.

Disregarding slight variations in the cavity's profiles in barrel cavity right sections taken at the openings in the barrel cavity walls for wall conductor's contact means and said means therein, right sections taken to the central cavity axis throughout the cavity are alike; i.e. cavity's profiles in right section planes to said cavity axis are alike.

The cavity's central axis is through the centroid centers of the cavity's profile in said right sections. Generally the central axis of an element is the line through the centroid centers of right sections taken through said element along a path in which said element's structure is uniform; e.g. the central axis of a barrel power rail is through the centroid centers of right sections (profiles) to the rail taken along its length other then at the breech where said rail has power take input means.

The gun has a pair of barrel power rails which are located across the cavity from each other, at, in or proximal the narrow end walls of the cavity; i.e. each of the pair of barrel power rails is located diametric the other across the cavity, in, at or proximal the cavity's narrow end walls. Each said power rail is referred to herein as a narrow wall power rail and said power rails are parallel to each other, have continuous barrel cavity surface their lengths, extend from proximal the barrel's breech end to proximal the barrel's muzzle end and in the energized gun share the same voltage potential and phase, and current phase.

There is a third barrel power rail, the midline power rail, which is parallel said narrow wall power rails, has continuous cavity surface its length and which also extends from proximal the barrel's breech end to proximal the barrel's muzzle end. The midline power rail is located at the midline of one of the two barrel cavity's broad walls between and adjoining said barrel cavity's narrow end walls. Each of said power rail has a power connection means to outside the barrel at its breech end for connection to and outside power source.

For orientation and element identification in the following descriptions of the invention, a hypothetical plane, the divide plane, is defined as extending the length of the barrel and cavity therein. The divide plane is coincident with the midline of each of said cavity's two broad walls between and adjoining the cavity's two narrow end walls, the cavity's central axis, and the axis of the midline power rail. The divide plane is not an actual physical entity in the invention. Projectiles for use in the barrel cavity also have divide planes which when in the barrel cavity are coincident with the divide plane of the barrel and barrel cavity.

The divide plane divides the gun's barrel and cavity therein into equal halves: the barrel's first collateral half and the barrel's second collateral half, herein after referred to as the first barrel's half and the second barrel's half, respectively. The divide plane also divides the gun barrel's cavity into two equal halves: the cavity's first collateral half and the cavity's second collateral half, herein after referred to as the cavity's first half and the cavity's second half, respectively. In like manner the divide plane of a projectile for the gun divides the projectile into two equal halves: the projectile's first collateral half and the projectile's second collateral half, herein after referred to as the projectile's first half and projectile's second half.

With the barrel in the palms (palms up) of the hands, with the thumbs at the cavity's narrow ends pointing towards the barrel's muzzle, and the midline power rail distal the palms of the hands, the barrel's half, the barrel cavity's half and the half of a projectile in the in the barrel cavity which is proximal the left hand is the barrel's first half, the cavity's first half and the projectile's first half, respectively, and the half of the barrel, barrel cavity and projectile in the barrel cavity which is proximal the right hand is the barrel's second half, the cavity's second half and the projectile's second half, respectively.

Twin elements of the device (i.e. the wall conductor assembles, the barrel cavity's walls and surfaces, the projectile's side surfaces and current shunts and shunt surfaces therein, etc.) are referred to herein as the “first” and the “second” element of the twin elements; e.g. the first wall conductor assembly or the second wall conductor assembly of the cavity's second half. Each element of twin elements has its identification as the “first” or the “second” element dependant on its proximity to the palm and fingers in the above orientation. An element of the twin elements in a barrel's first or second half, a cavity's first or second half, or a projectile's first or second half which is closest to a hand's palm in the above orientation is the “first” element and the remaining twin element is the “second” element. In the figures herein, the broad wall and side of the cavity with the midline power rail is the second broad wall or side; i.e. the second broad wall or the second side of the cavity's first and second half.

In addition to the surface of its narrow cavity wall, each cavity's half has a first and second (cavity) wall and the projectile halves have first and second surfaces which in the cavity are proximal said walls. The divide plane, the narrow end walls, and the breech and muzzle ends of the barrel cavity where the invention is extant in the barrel are the boundaries of said four cavity wall segments.

There is a wall conductor assembly in each of said four cavity walls; i.e. there is a first wall conductor assembly in the first wall of the cavity's first half and a second wall conductor assembly in the second wall of said cavity's half and there is a first wall conductor assembly in the first wall of the cavity's second half and a second wall conductor assembly in the second wall of said cavity's half.

The barrel bus of the wall conductor assembly in the first wall of the cavity's first half and the barrel bus of the wall conductor assembly in the first wall of the cavity's second half are each located, in their respective cavity's half, proximal and parallel to the divide plane. Said barrel buses are electrically isolated from each other. The barrel bus of the wall conductor assembly in the second wall of the cavity's first half and the barrel bus of the wall conductor assembly in the second wall of the cavity's second half are each located in their respective cavity's half and said barrel buses are parallel, proximal and electrically isolated from the midline power rail and each other.

An element that is ‘electrically isolated’ from another element or an ‘isolated element’ is limited in meaning to the lacking a direct low resistance current path to the neighboring element; i.e. the electrically isolated element is electrically insulated from its neighbor; however, an element can be electrically isolated from one element while having electrical continuity therewith through another element it is not electrically isolated from and that in turn has direct or indirect continuity with said isolated element. Magnetic and electric fields couplings are ignored.

Each said wall conductor assembly in each cavity half also has an array of parallel, spaced wall conductors which are orthogonal the cavity's central axis and at or closely proximal to the surface of the cavity's wall it is in. Said wall conductors can be equal in length or have slight variations in length to permit a more even wear of the current shunts of projectiles traversing the barrel cavity. The barrel bus of each of the wall conductor assembles in both cavity halves extends at least from the muzzle proximal edge of the wall conductor at the breech end of the wall conductor assembly to the breech proximal edge of the wall conductor at the muzzle end of said assembly. In each said wall conductor assembly, each wall conductor of said assembly's array of wall conductors is electrically continuous with said assembly's barrel bus at said wall conductor's end thereto proximal and extends therefrom to proximal the narrow wall of its respective cavity's half. Each wall conductor of the array of wall conductors of each wall conductor assembly has, at its end distal its assembly's barrel bus, electrical continuity with a contact means that extends through a mating opening into the cavity's half with said wall conductor assembly.

As the barrel and barrel cavity containing the invention might extend beyond the array of wall conductors of the wall conductor assembles in both the breech and muzzle directions, the right section plane through the muzzle proximal edge of the wall conductor assembles' wall conductors closest to the muzzle is designated the muzzle end of the barrel and barrel cavity of the invention as electric circuit effecting a projectile's acceleration through the barrel cavity of the invention is open when the projectile's forward current shunt is beyond this point in its barrel cavity traverse.

The right section plane through the breech proximal edge of said assembles' wall conductors closest to the breech is designated the breech end of the barrel and barrel cavity of the invention as the projectile's aft current shunts must have electrical continuity with said wall conductors to initially complete the electric circuit for the projectile's acceleration through the barrel cavity of the invention. Therefore, the length along the barrel's length occupied by the wall conductor assembles arrays of wall conductor is the invention's length and location along the length of a barrel and barrel cavity which includes the invention.

The barrel power rails might extend beyond the invention in either direction as a source of power for operations in the barrel and barrel cavity not part of the invention. The barrel bus in like manner might extend beyond the invention as a possible signal source for operations in the barrel and barrel cavity not part of the invention.

The narrow wall power rail in each cavity's half that has electrical continuity with the first forward current shunt of the respective projectile's half in barrel cavity might be shortened in length at its breech end by as much as the distance between the muzzle proximal edges of the forward and aft current shunts and the midline power rail might be shortened at its muzzle end by as much as the distance between the breech proximal edges of the forward current shunt and propulsion bus surface with continuity said power rail.

As noted above the invention has two wall conductor assembles in each cavity's half. The first wall conductor assembly is located in the first wall of a cavity's half and the second wall conductor assembly is located in the second wall of said cavity's half. Each wall conductor assembly extends the length of the barrel and barrel cavity of the invention. In each barrel's half, one wall conductor assembly can be the mirror image of the other wall conductor assembly; i.e. the first wall conductor assembly can be the mirror image of the second wall conductor assembly in a cavity's half and one cavity's half and barrel's half can be the mirror image of the second cavity's half and second barrel's half.

The projectiles for the device, as noted above, have halves on either side of their divide plane. Projectiles have a central axis in its divide plane that, with the projectile in the barrel cavity, is in the barrel cavity's divide plane and is coincident or close and parallel the cavity's central axis. All projectile right section profiles are smaller then the barrel cavity right section profile.

The projectiles have a breech end and a muzzle end that, when in the barrel cavity, are the projectile's ends closest to the cavity's breech and muzzle ends, respectively.

Each projectile's half has a propulsion bus midway along its axial extent that is oriented orthogonal the projectile's central axis and that, when in the barrel cavity, is orthogonal the barrel cavity's central axis and the direction of traverse through the barrel cavity by the projectile.

Herein, when an electrically conducting element of the projectile has electrical continuity with an electrically conducting element or elements in the barrel said electrical continuity is sliding electrical continuity with projectile movement in the barrel cavity.

When a projectile is in the barrel cavity, one end of the propulsion bus in each projectile's half has continuous electrical continuity with the midline power rail.

The propulsion bus in each projectile's half extends from its midline power rail continuity across its projectile's half in its respective cavity's half to proximal the narrow wall of said cavity's half, where it has continuous electrical continuity with the propulsion bus-aft shunt current bus of said projectile's half.

The propulsion bus in each projectile's half in its respective cavity's half, except for its electrical continuity with the midline power rail at one end, and its electrical continuity with the propulsion bus-aft shunt current bus at its other end, is electrically isolated from other conducting elements of said projectile's half and the cavity's half and barrel's half said projectile's half is in. The propulsion bus in each projectile's half divides said projectile's half into two sections: the muzzle section with the projectile half's muzzle end and the breech section with the projectile half's breech end.

Each projectile's half has a first forward current shunt and a second forward current shunt located in its muzzle section. The first forward current shunt of a projectile's half in the barrel cavity is at the projectile's edge that has close proximity with the cavity's half's narrow end wall and the narrow wall power rail thereat and has surface that has continuous electrical continuity with the cavity surface of said power rail. Said first forward current shunt also has surface in the first side of said projectile's half.

The second forward current shunt of the topic projectile's half in the barrel cavity is located lateral to the first forward current shunt's location in the projectile's half and has surface in the second side of the said projectile's half.

The first and second forward current shunts in a projectile's half are electrically isolated from each other.

In a projectile's half, the first forward current shunt's surface in the projectile half's first surface is, when in its respective cavity's half, located proximal the first wall of said cavity's half and the wall conductor assembly therein; i.e. the first wall conductor assembly of said cavity's half. Said shunt surface has electrical continuity with contact means of said assembly's wall conductors at said shunt surface's cavity location. The group of one or more wall conductors of the first wall conductor assembly in the topic cavity's half whose contact means have electrical continuity at any instant with said first forward current shunt's surface is referred to herein as the first forward wall conductors of the cavity's half.

The first forward current shunt of a projectile's half in its respective cavity's half, via its surface with continuous electrical continuity with its proximal power rail and its surface with continuous electrical continuity with the contact means of the first forward wall conductors of said cavity's half, maintains continuous electrical continuity between said power rail and the first wall conductor assembly and with power supplied to the power rails maintains a current path between said power rail and said wall conductor assembly.

In the same collateral half of the projectile, the second forward current shunt's surface in the projectile's second surface is, with the projectile's half in its respective cavity's half, located proximal the second wallf of said cavity's half and the wall conductor assembly therein; i.e. the second wall conductor assembly of the cavity's half. Said second forward current shunt's surface, at its barrel cavity location, has electrical continuity with the contact means of the second wall conductor assembly's wall conductors thereat. The group of one or more wall conductors of the second wall conductor assembly that has electrical continuity, via their contact means, with said current shunt's surface at any instant are the second forward wall conductor of the cavity's half. The second forward current shunt of a projectile's half also has continuous electrical continuity with aft shunt-forward shunt current bus in the projectile which is located proximal said shunts in said projectile's half and is between and connects the second forward current shunt with the first aft current shunt of the projectile's half.

The second forward current shunt of a projectile in the barrel cavity, via its continuous electrical continuity with aft shunt-forward shunt current bus and its surface with continuous electrical continuity with the cavity half's second forward wall conductors, maintains continuous electrical continuity between said current bus and the second wall conductor assembly and with power supplied to the power rails maintains a current path between the aft shunt-forward shunt current bus and said wall conductor assembly.

Each projectile's half for the device has a first aft current shunt and a second aft current shunt located in its breech section. With the projectile in the barrel cavity, the first aft current shunt of a projectile's half, in its respective cavity's half, has surface in the first side of the projectile's half and is at the projectile edge that has close proximity with the narrow cavity wall of said cavity's half. The second aft current shunt is located in the topic projectile's half lateral to said first aft shunt's location and has surface in the second side of said projectile's half. The first and second aft current shunts are electrically isolated from each other.

The first aft current shunt's surface in the first surface of said projectile's half is, with the projectile in the barrel cavity, located proximal the first surface of the respective cavity's half and the wall conductor assembly therein; i.e. the first wall conductor assembly. Said shunt surface, at its barrel cavity location, has electrical continuity with the contact means of said assembly's wall conductors thereat. The group of one or more wall conductors whose contact means at any instant have electrical continuity with the first aft current shunt's surface are the first aft wall conductors of the cavity's half. As noted above the first aft current shunt of a projectile's half also has electrical continuity with the second forward current shunt of the projectile's half via the aft shunt-forward shunt current bus of the projectile's half.

The first aft current shunt of a projectile's half in its respective cavity's half, via its continuous electrical continuity with the aft shunt-forward shunt current bus and its surface with continuous electrical continuity with the first aft wall conductors of the cavity's half, maintains continuous electrical continuity between said current bus and the first wall conductor assembly of said cavity's half and with power supplied to the power rails maintains a current path between the aft shunt-forward shunt current bus and the first wall conductor assembly of said cavity's half.

In a projectile's half the second aft current is located in the projectile's second surface lateral said first aft current shunt and the second aft current shunt's surface in said second surface of the topic projectile's half is, with the projectile's half in its respective cavity's half, located proximal the second wall of said cavity's half and the wall conductor assembly therein; i.e. the second wall conductor assembly of the cavity's half. Said second aft current shunt surface, at its barrel cavity location, has electrical continuity with the contact means of the wall conductors of the second wall conductor assembly thereat. The group one or more wall conductors of the second wall conductor assembly that has electrical continuity, via their contact means, with the second aft current shunt's surface at any instant are the second aft wall conductors. The second aft current shunt of the topic projectile's half in its respective barrel cavity's half also has continuous electrical continuity with propulsion bus of said projectile's half via the propulsion bus-aft shunt current bus which extends between said second aft current shunt and said propulsion bus of the projectile's half.

The second aft current shunt of the topic projectile's half in its respective cavity's half, via its continuous electrical continuity with propulsion bus-aft shunt current bus and its surface with continuous electrical continuity with the second aft wall conductors of said cavity's half, maintains continuous electrical continuity between the propulsion bus-aft shunt current bus of said projectile's half and the second wall conductor assembly of said cavity's half and with power supplied to the power rails the second aft current shunt of the topic projectile's half maintains a current path between said propulsion bus-aft shunt current bus and said wall conductor assembly.

The barrel bus of each wall conductor assembly in each cavity's half maintains continuous electrical continuity between the wall conductors of the assembly which at any instant are the forward wall conductors and the aft wall conductors of said assembly and maintains a continuous current path between said forward and aft wall conductors when power is supplied to the gun.

A cavity's half (i.e. barrel's half cavity) and the projectile's half therein is now used to discuss the operation of the gun. The various stages in the propulsion of a projectile through the barrel cavity occurring in one half of the barrel cavity and the projectile's half therein concomitantly occur in the second half of the barrel cavity and the projectile's half therein.

With the positive terminal of an outside power supply connected to the connection lug of the narrow wall power rail of the topic half cavity and the return terminal connected to the midline power rail, and with a projectile in the barrel cavity, the current is muzzle directed in said narrow wall power rail and the magnetic fields of said current interacts with the current in the propulsion bus in the topic half projectile creating forces in said propulsion bus with muzzle directed, cavity axis parallel components. The magnetic fields of the current in said positive narrow wall power rail also interacts to a lesser degree with the current in the propulsion bus in the projectile's second half creating therein forces oppositely directed; i.e. forces with breech directed, cavity axis parallel components.

The current continues from said positive rail through the first forward current shunt of topic half projectile to the forward wall conductor of the first wall conductor assembly of the topic cavity half,[i.e. the first forward wall conductors of the cavity half] via the continuity that the contact means of the wall conductors comprising the group of forward wall conductors have with surface of the said forward current shunt. The current is barrel bus directed [i.e. the current's direction is toward midline power rail] in said forward wall conductors. The magnetic fields of the current in the forward wall conductors of the first wall conductor assembly interact with current in said propulsion bus creating forces in said propulsion bus with barrel cavity axis parallel, muzzle directed components.

The current continues from the forward wall conductors of the first wall conductor assembly in the topic cavity's half to said assembly's barrel bus, wherein it has breech direction. The magnetic fields of the current in the barrel bus of the first wall conductor assembly interacts with the current in the propulsion bus of the topic projectile's half creating forces in said propulsion bus with cavity axis parallel, muzzle directed components, additionally, said magnetic fields interact with the current in the propulsion bus in projectile's second half also creating forces therein with cavity axis parallel, muzzle directed components.

The current continues from the barrel bus to the aft wall conductors [i.e. the group of one or more wall conductors whose contact means have electrical continuity with the first aft current shunt at any instant] of the first wall conductor assembly [i.e. the first aft wall conductors of the cavity half] and therein toward the narrow cavity wall of the topic cavity's half. The magnetic fields of the current in the aft wall conductors of the first wall conductor assembly in the topic half cavity interact with the current in the propulsion bus of the projectile's topic half creating forces with muzzle directed, cavity axis parallel components in said propulsion bus.

The current continues, from the first aft current shunt to the second forward current shunt of the projectile's half via the aft shunt-forward shunt current bus there between in said projectile's half. The current in said bus is muzzle directed as it is in the proximal positive power rail (i.e. narrow wall power rail) and there are large forces of attraction between said power rail and said bus lateral to the direction of cavity traverse by the projectile. However, this force is balanced by a like but oppositely directed force between the like bus and power rail in the second projectile's half and barrel's second half cavity, respectively.

The current continues from second forward current shunt to the forward wall conductors of the second wall conductor assembly of the topic half cavity; i.e. the current continues via said current shunt's surface that has continuous electrical continuity with the contact means of the one or more wall conductor comprising the forward wall conductors of the second wall conductor assembly at any instant; i.e. the second forward wall conductors of the topic half cavity. The current in the forward wall conductors of said second wall conductor assembly has barrel bus direction, the same direction as the current in the forward wall conductors of the first wall conductor assembly. The magnetic fields of the current in the forward wall conductors of the second wall conductor assembly in the topic cavity's half [i.e. second forward wall conductors of the cavity half] interact with the current in the propulsion bus in the projectile's half therein creating forces in said propulsion bus with muzzle directed, cavity axis parallel components.

The current continues from second forward wall conductors to the barrel bus of the second wall conductor assembly of the topic cavity half and therein has breech direction. The magnetic fields of the current in the barrel bus of said second wall conductor assembly interact with the current in the propulsion bus in the projectile's topic half creating forces in said propulsion bus with muzzle directed, cavity axis parallel components, additionally said magnetic fields interact with the current in the propulsion bus in the projectile's second half also creating forces therein with cavity axis parallel, muzzle directed components.

The current continues from the barrel bus of said second wall conductor assembly to the aft wall conductors of said assembly; i.e. the second aft wall conductors of the cavity half. The currents in the aft wall conductors of said second wall conductor assembly are directed away from the barrel bus towards the narrow cavity wall of said cavity half and the positive power rail thereat. The currents direction in the aft wall conductors of the first wall conductor assembly and in the aft wall conductors of the second wall conductor assembly in the topic barrel's half cavity, are the same. The magnetic fields of the current in the aft wall conductors in said second wall conductor assembly interacts with the current in the propulsion bus in the topic projectile's half creating forces in said propulsion bus with muzzle directed, cavity axis parallel components.

The current continues to the second aft current shunt via the electrical continuity of the contact means of the group of one or more wall conductors comprising the aft wall conductor of the second wall conductor assembly at any instant with surface of the second aft current shunt [i.e. second aft wall conductors of the topic cavity half] and there through via the propulsion bus-aft shunt current bus to the propulsion bus of the topic projectile's half. The current in said current bus is muzzle directed as it is in the proximal narrow wall power rail and there are large forces of attraction between said power rail and said current bus lateral to the direction a projectile's cavity traverse. However, this force is also balanced by a like but oppositely directed force between the like bus and power rail in the projectile's second half and cavity's second half, respectively.

The current continues from said current bus to the propulsion bus in the topic half projectile wherein it is acted on by the magnetic fields of the current in its surrounding current paths during its barrel cavity traverse, creating forces therein with components whose net effect is the propulsion of the projectile through the barrel cavity.

Current exits the propulsion bus of the topic projectile's half to the midline power rail via said propulsion bus's continuous electrical continuity with said power rail. The current in the midline power rail is breech directed and the magnetic fields of the current in the said power rail interact with the current in the propulsion bus in the topic projectile's half creating forces therein with cavity axis parallel, muzzle directed components. The magnetic field in the midline power rail also interacts with the current in the propulsion bus of the projectile's second half also creating therein forces with cavity axis parallel, muzzle directed components.

The magnetic fields of the current in the above described circuitry surrounding the propulsion bus in a projectile's half traversing its respective barrel cavity half, interact with the propulsion bus current in said projectile's half creating forces in the propulsion bus with muzzle directed, cavity axis parallel components which propel the projectile in said barrel cavity traverse.

Regardless the instant polarity of the narrow wall power rails with reference to the midline power rail, the current direction in the forward wall conductors of the wall conductor assembles in a cavity's half is always the same as the current direction in the propulsion bus of the projectile's half in said cavity's half, the current direction in the aft wall conductors of the wall conductor assembles in a cavity's half is always oppositely directed the current direction in the propulsion bus of the projectile's half in said cavity's half, the current direction in the barrel buses of the wall conductor assembles and the current direction in the midline power rail is always the same, and the current direction in the current buses in the projectile's halves is always the same as the current direction in their proximal narrow wall power rail.

Regardless the common polarity of the narrow wall power rails with reference the polarity of the midline power rail, the magnetic fields of the current in the gun has the net effect of propelling a projectile in the gun's barrel from breech towards muzzle.

A generalized equation for approximating forces on the propulsion bus in a projectile's half in this design is: $\begin{matrix} {{Force} = {{\int_{r_{o}}^{r_{x} - r_{{midline}\quad{power}\quad{rail}}}{I{\mathbb{d}{rx}}\quad\mu_{o}{I/\left( {2\pi\quad r} \right)}}} - {\int_{r_{x} + r_{{midline}\quad{power}\quad{rail}}}^{{2r_{x}} - r_{o}}{I{\mathbb{d}{rx}}\quad\mu_{o}{I/\left( {2\pi\quad r} \right)}}} + {2({.9}){\int_{a}^{r_{x} - r_{o\quad}}{I{\mathbb{d}{rx}}\quad\mu_{o}{I/\left( {2\pi\quad r} \right)}}}} + {\int_{r_{{midline}\quad{power}\quad{rail}}}^{r_{x} - r_{o\quad}}{\left( {2I} \right){\mathbb{d}{rx}}\quad{{\mu_{o}\left( {2I} \right)}/\left( {2\pi\quad r} \right)}}} + {4{\int_{L_{o}}^{L_{1}}{I{\mathbb{d}{lx}}\quad\mu_{o}I\quad{Cos}\quad{\alpha/{\left( {2\pi\quad d} \right).}}}}}}} & \left. 3 \right) \end{matrix}$

In the above equation the integral limit: r_(x) is half the distance between the diametrically opposed narrow walls of the barrel cavity and the distance from the center line of the midline power rail to a narrow cavity wall, r_(midline power rail) is the radius of the midline power rail, r_(o) is the distance between the narrow wall power rail in a cavity's half and the juncture of the propulsion bus-aft shunt current bus with the propulsion bus in said cavity's half, a is the distance between a barrel bus and the midline power rail as measured in the cavity plane common to the center lines of the power rails, and L₁ and L₀ are the end points of the length common to both the propulsion bus in a projectile's half and the forward and aft wall conductors in the wall conductor assembles in the respective barrel's half cavity.

The first integral in the above equation acquires the value of the force in newtons on the propulsion bus in a projectile's half directed toward the barrel muzzle due to the magnetic fields of the current I in the narrow wall power rail of the respective cavity's half.

The second integral gives the force in newtons on the said propulsion bus directed towards the breech due to the magnetic fields of the current I in the narrow wall power rail in the cavity's second half, and can be approximated by its maximum value of −Ln(2) μ_(o)l²/(2π) newtons.

The third integral acquires the value of force in newtons on the topic half projectile's propulsion bus due to the magnetic fields of the current in the barrel buses of the first and second wall conductor assembly of the respective cavity's half.

The fourth integral acquires the value of force in newtons on the topic half projectile's propulsion bus due to the magnetic fields of the currents in the barrel buses of the first and second wall conductor assembles in the barrel's second half cavity. The 0.9 coefficient in the third and fourth integrals is a correction factor for the displacement of the center lines of the said barrel buses from the plane through the center lines of the power rails.

The fifth integral acquires the force in newtons on the topic propulsion bus due to the magnetic fields of the current in the midline power rail. The current therein is twice the current in the narrow wall power rails and the integral's value is approximately 4 times the value of the first integral.

The sixth integral expression is an approximation of the combined forces on the propulsion bus in the topic projectile's half attributed to forward and aft wall conductors of the first and second wall conductor assembles in the topic half cavity. The ‘d’ in the (Cos α)/(2πd) term is the instant distance between the center line of a forward or aft wall conductor and the center line of the propulsion bus and α is the instant angle ‘d’ has to said plane through the power rails' center lines. The (Cos α)/(2πd) term has a mean value acquired by computer iteration and is dependant on the physical dimensions of a particular design and the number of wall conductors with shunt continuity at any instant and their distribution. The dl limits are the ends of the minimum common length of said wall conductors and the topic projectile's propulsion bus and the length (L₁-L₀) only important regardless the source.

General Comments

The right section barrel cavity profiles at the contact means and their cavity surface ports may have slight irregularities; however, these irregularities are disregarded herein and said right section barrel cavity profiles, regardless said irregularities, are regarded as the same as all other right section barrel cavity profiles.

Mathematical expressions used herein; e.g. perpendicular, tangent, parallel, etc., to describe physical characteristics, spacial orientations etc., are limited in their accuracy to the practical limitation of any of the manufacturing and assembly methods that might be used for the device.

Whether by design or unavoidable, when an arc between the power rails develops behind the projectile of the invention, it will be confined to the space immediately behind the projectile's propulsion bus rather then extend through the entire barrel cavity region behind the projectile. This is the result of the forces imposed on the arc current by the magnetic fields of the currents in aft wall conductors.

Although the wall conductors for devices illustrated herein have constant cross section areas, in applications where barrel mass is an important constraint, the cross section area of wall conductors at the barrel breech, where the conduction time intervals of the wall conductors are many times the conduction time intervals of wall conductors located near the muzzle, can be larger then the cross section areas of wall conductors at the muzzle. There can be one or more wall conductors, or the equivalent sum in cross section areas to one or more wall conductors, in contact with a projectile's forward or aft current shunts.

Additionally the wall conductors near the breech might be closer together while still parallel and insulated from each other; i.e. the wall conductors would no longer have uniform distribution along their common barrel buss.

For clarity of presentation, the invention embodiments portrayed in the following illustrations are chemically bonded together in assembly. In practical application and for ease of manufacture and repair, the devices would be assembled using mechanical fastening means well know in the arts.

Molding methods well know in the arts can be used for projectile and barrel fabrication. Barrel and projectile structures can be of proprietary plastics or engineered ceramics such as SiC. The projectile's propulsion buses and current shunts—whose operation life is measured in fractions of a millisecond—can be simple formed pieces of sheet metal Aluminum or Copper or other conductor, mass restriction permitting. As a safety measure the propulsion bus could be designed to burst open or melt from heat build up after its anticipated barrel cavity traverse time.

Voids and masses necessary to locate the projectile's center of mass for in flight stability are not shown in the following figures.

The surfaces of elements of the invention with sliding continuity with other elements thereof might be treated and/or machined and/or formed to effect a smooth more effective sliding continuity; e.g. a surface with boundary edges rounded and surface treated with low friction conducting substances and/or textured to assure a correct current path when elevated voltages are extant in the invention. The projectile may have variation in its surface extruded in the direction of its cavity traverse; e.g. corrugated surface with troughs parallel the barrel cavity axis.

The barrel and its cavity may extend at the muzzle and/or breech beyond the electromotive propulsion elements of the invention and in said extensions the projectile may or may not be acted on by additional motive, orientation, material modifying or other devices not part of the invention; i.e. the invention may share a common barrel and barrel cavity with other devices not part of the invention.

All electrical continuities between conducting elements in the barrel and conducting elements in the projectile are sliding electrical continuities with movement of the projectile in the barrel cavity.

The figures herein are not proportionally correct but are presented to best illustrate the principles of the invention's operation. For the projectile's thickness indicated in the figures, the distance between the narrow walls of the cavity would be three, four or more times the distance indicated in the figures. As indicated in equation 3, the force acting on the projectile's propulsion buses due to the forward and aft wall conductors is proportional to said wall conductor's common length with the projectile's propulsion buses.

The wall conductor assembles in the first cavity walls of the first and second cavity half and the wall conductor assembles in the second cavity walls of the first and second cavity half can have a common barrel bus. Each common barrel bus would have its midline (axis) coincident the divide plane and have extending therefrom towards each narrow cavity wall and the power rail thereat an array of wall conductors for each cavity's half. This has the slight advantage of reducing the gun's complexity, but permits cross over currents between the cavity's half circuits.

Discussion of the Drawings

FIG. 1 is a view of a shortened assembled gun of the invention and a projectile 32 for use therein. The gun's barrel has a first section 11 and a second section 11 a. Indicated in barrel section 11 is an open channel w13 of the array of open channels in the barrel's first half and an open channel x13 of the array of open channels in the barrel section's second half in which mount the array of wall conductors of the wall conductor assembles w16 and x16 in the first cavity walls of the first and second cavity halves, respectfully. Also, indicated are contact means w19 and x19 of the arrays of contact means of the first wall conductor assembles w16 and w16, respectively, mounted in their respective wall conductor's open channel w13 and x13.

Indicated is the breech cap 6 with extension 33 a therein of barrel cavity 33 with its first and second collateral half extension parts w33 a and x33 a there through. The extension of the profile of the surface 27 of midline power rail 26 in the material of breech cap 6 is indicated as 27 a and the profile of cavity guide 23 in the material of breech cap 6 is indicated as 23 a. The axis of guide 23 and its extensions and the axis of the midline power rail 26 and its profile's extensions are in the divide plane of the cavity. Also indicated are the lug 31 which is common to both of the narrow wall power rails. The narrow wall power rails are in, at or proximal the cavity's narrow end walls. Power lug 28 of midline power rail 26 is also indicated. The leads from an outside power supply connect to lug 31 and lug 28.

Also indicated is a projectile 32 for use in the collateral barrel with its first collateral half w32, hereinafter the projectile's first half, and its second collateral half x32, hereinafter the projectile's second half. The projectile's first half w32 has end cap w45 with guide w4 and the projectile's second half x32 has end cap x45 with guide x4. Indicated in the first surface of the projectile's first half w32 are the first forward current shunt w34 and the first aft current shunt w37. Indicated also are the first forward current shunt x34 and first aft current shunt x37 in the first surface of the projectile's second half x32. Guide way 46 at the junction of a projectile's collateral halves is also indicated and with the projectile in the barrel cavity, cavity guide 23 is in guide way 46 and therein maintains proper orientation of said projectile during its barrel cavity traverse.

FIG. 2 is the gun in FIG. 1 shortened and disassembled. Shown are the array of wall conductors w18, the array of their contact means w19 and the barrel bus w17 of the first wall conductor assembly w16 for the first half of barrel section 11 and the arrays of wall conductors x18, the array of their contact means x19 and the barrel bus x17 for the first wall conductor assembly x16 for the second half of the first barrel section 11. Wall conductor assembles w16 and x16 in the assembly are in the arrays of open channels w13 and x13, respectively, in barrel section 11. Indicated also is the barrel's breech cap 6 discussed above.

Indicated are the narrow wall power rail w29 of the first cavity half and its cavity surface w30 and the narrow power rail x29 of the second cavity half and its cavity surface x30. Power rail surface w30 has guide way w3 throughout its length and power rail surface x30 has guide way x3 throughout its length and the w4 and x4 guides, respectively, of a projectile in the barrel cavity travel in said guide ways and their extensions in the barrel. Indicated are the common power bus w31 from the power lug 31 to the narrow wall power rail w29 and common power bus x31 from said power lug to the narrow wall power rail x29.

Narrow wall power rail w29 mounts in open channel w1 in rail subassembly w25 with the extension of common bus w31 to said power rail through open channel w25 d in said subassembly. Rail subassembly w25 in turn mounts in open channels w11 d and w11 da in barrel sections 11 and 11 a, respectively, in the assembled gun. Narrow wall power rail x29 mounts in open channel x1 in rail subassembly x25 with the extension of common bus x31 to said power rail through open channel x25 d in said subassembly. Rail subassembly x25 in turn mounts in open channels x11 d and x11 da in barrel sections 11 and 11 a, respectively, in the assembled gun. Common power bus branch w31 mounts in channel w11 c and common power bus branch x31 mounts in channel x11 c in barrel section 11.

Indicated are the midline power rail 26, its cavity surface 27 and power lug 28 to outside the barrel. Power rail 26 with lug 28 mounts in channel 11 b in barrel section 11 a. The second wall conductor assembly for the first cavity's half w33 is w16 a. Indicated are said assembly's arrays of wall conductors w18 a and contact means w19 a and its barrel bus w17 a. The second wall conductor assembly for the second cavity's half x33 is w16 a. Indicated are said assembly's arrays of wall conductors x18 and contact means x19 a and its barrel bus x17 a. Also indicated in FIG. 2 is a projectile 32 discussed above with its breech end indicated.

Indicated in barrel section 11 a are the second cavity wall w20 a the cavity's first half w33 and the second cavity wall x20 a of the cavity's second half x33. In said second wall w20 a is indicated one of the arrays of openings w21 a. A contact means w19 a of the second wall conductor assembly w16 a of the cavity's first half extends through each said openings into the topic half cavity. In said second wall x20 a is indicated one of the arrays of openings x21 a. A contact means x19 a of the second wall conductor assembly w16 a of the cavity's second half extends through each said openings into the topic half cavity.

There are a like array of openings, w21 in the first wall w20 of first cavity's half w33 and x21 in the first wall x21 of the second cavity's half x33, respectively. Contact means w19 of the first wall conductor assembly of the cavity's first half extend into the cavity through mating openings w21 in the first wall of the first cavity's half and contact means x19 of the first wall conductor assembly of the second cavity's half extend into the cavity through mating openings x21 in the first wall of the second cavity's half.

FIG. 3 is a cut-a-way view of the gun near its breech to illustrate the arrangement of the various parts of an assembled gun with a projectile 32 in the gun's cavity 33. The first barrel section 11 with its first wall w20 of the cavity's first half w33 and the array of openings w21 in said wall for the contact means w19 of the wall conductors w18 of the first wall conductor assembly w16 of the cavity's first half w33 along with the barrel bus w17 of said assembly are indicated.

Also indicated are the first wall x20 of the cavity's second half x33 and the array of openings x21 in said wall for the contact means x19 of the wall conductors x18 of the first wall conductor assembly w16 of the cavity's second half x33 along with barrel bus x17 of said assembly. Indicated also in barrel section 11 are a open channel w13 in which is mounted a wall conductor w18 with its contact means w19 of the first wall conductor assembly w16 of the cavity's first half w33 and a open channel x13 in which is mounted a wall conductor x18 with its contact means x19 of the first wall conductor assembly x16 of the cavity's second half x33.

Also indicated in the cavity wall of barrel section 11 is guide 23 at the divide plane of the cavity which is in guide way 46 of projectile 32. Indicated also in barrel section 11 are open channels w11 d and x11 d which with open channels w11 da and x11 da of barrel section 11 a retain rail subassembly w25 with narrow wall power rail w29 of the cavity's first half w33 and rail subassembly x25 with narrow wall power rail x29 of the cavity's second half x33, respectively.

The second side of the projectile's first half w32 with the second forward current shunt w34 a and the second aft current shunt w37 a in the cavity's first half w33 and the second side of projectile's second half x32 with second forward current shunt x34 a and second aft current shunt x37 a in the cavity's second half x33 is indicated.

Indicated also in figure three, along with the leading edge 43 of the projectile 32 in the barrel cavity 33, is the midline power rail 26 which travels in guide way 46 a of a projectile in the barrel cavity and wherein it has continuous electrical continuity with the propulsion bus in both halves of the projectile. Barrel section 11 a is indicated with open channels w13 a and x13 a for wall conductors w18 a and w18 a, respectively, and their respective contact means w19 a and w19 a, of the second wall conductor assembles w16 a and x16 a of the first and second half cavities, respectively. Indicated also are breech cap 6 and connection lug 28 of power rail 26 to outside the barrel.

FIG. 4 is framed section A in FIG. 3, enlarged. Shown is a contact means w19 a of the second wall conductor assembly w16 a of the cavity's first half w33 in its respective barrel's open channel w13 a. Each contact means w19 a has threaded end w19 ae in its respective threaded channel w21 a opening to the first cavity's half w33 through said cavity half's second wall w20 a. Contact means w19 a is adjusted in said opening using hex head w19 aa at the end of shank w19 ab and locked in place with lock nut w19 ad. Conducting yoke w19 ac mounted on the contact means shank w19 ab and the tang w18 ab of wall conductor w18 a provides continuous electrical continuity between said wall conductor and said contact means.

FIG. 5 is framed section B in FIG. 3, enlarged. Shown are a wall conductor w18 a at its end distal its contact means w19 a where it has continuous electrical continuity with the barrel bus w17 a of the second wall conductor assembly of the first cavity's half w33. The end of said wall conductor w18 a has structure w18 ac which is formed to snap over the barrel bus w17 a and maintain continuous electrical continuity therewith.

FIG. 6 is an oblique view of the first side of a collateral projectile 32 for use in collateral barrel cavity 33. Indicated are said projectile's first half w32 and the first forward current shunt w34 therein and said shunt's surface w35 that in the barrel cavity has electrical continuity with the contact means w19 of the first wall conductor assembly w16 of the cavity's first half w33 and surface w36 of said shunt which in the barrel cavity has continuous electrical continuity with the cavity surface w30 of the narrow wall power rail w29 of said cavity's half. Each wall conductor w18 whose contact means w19 at any instant has electrical continuity with the forward current shunt's surface w35 is one of the group of one or more wall conductors with said electrical continuity at any instant comprising the first forward wall conductors of the cavity's first half.

Also in the first surface of the projectile's first half w32 is first aft current shunt w37 and its surface w38 which when in the barrel cavity also has electrical continuity with contact means w19 of the first wall conductor assembly w16 in the cavity's first half w33. Each wall conductors w18 whose contact means w19 has electrical continuity at any instant with surface w38 of the first aft current shunt w37 is one of the group of one or more wall conductors with said electrical continuity comprising the first aft wall conductors of the cavity's first half at any instant. Indicated are end cap w53 which in the cavity's first half w33 is proximal the narrow wall power rail w29 and guide w4 of end cap w53 is in the guide way w3 of narrow wall power rail w29.

Indicated are said projectile's second half x32 and the first forward current shunt x34 therein and said shunt's surface x35 that in the barrel cavity has electrical continuity with the contact means x19 of the first wall conductor assembly x16 of the cavity's second half x33 and said shunt's surface x36 which in the barrel cavity has continuous electrical continuity with the cavity surface x30 of the narrow wall power rail x29 for said cavity's half. Each conductors x18 whose contact means x19 at any instant has electrical continuity with said forward current shunt's surface x35 is one of the group of one or more wall conductors having said electrical continuity at any instant comprising the first forward wall conductors of the cavity's second half.

Also in the first surface of the projectile's second half x32 is first aft current shunt x37 and its surface x38 which when in the barrel cavity has electrical continuity with contact means x19 of the first wall conductor assembly x16 in the cavity's second half x33. Each wall conductor x18 whose contact means x19 has electrical continuity at any instant with surface x38 of the first aft current shunt x37 is one of the group of one or more wall conductors with said electrical continuity comprising the first aft wall conductors of the cavity's second half at any instant.

Indicated are end cap x53 which in the cavity's first half x33 is proximal the narrow wall power rail x29 therein and end cap guide x4 is in guide way x3 in said power rail. Also indicted in FIG. 6 is the breech proximal edge 44 of the projectile when in the barrel cavity and guide way 46 whose axis is coincident the projectile's divide plane. With the projectile 32 in the barrel cavity 33, guide 23 located in the cavity's first broad wall with its axis coincident with the divide plane of the barrel cavity is in guide way 46 in the projectile's first side at the junction of the projectile's first and second halves; i.e. w32 and x32, respectively.

FIG. 7 is an oblique view of the second side of collateral projectile 32. In addition to the elements discussed in FIG. 6 are indicated the second side of the first projectile's half w32 and the second forward current shunt w34 a therein and said shunt's surface w35 a that in the barrel cavity has electrical continuity with the contact means w19 a of the second wall conductor assembly w16 a of the cavity's first half w33.

Each wall conductor w18 a whose contact means w19 a at any instant has electrical continuity with the forward current shunt's surface w35 a is one of the group of one or more wall conductors at any instant comprising the second forward wall conductors of the cavity's first half.

Also in the second surface of the projectile's first half w32 is second aft current shunt w37 a and its surface w38 a which when in the barrel cavity has electrical continuity with contact means w19 a of the second wall conductor assembly w16 a in the first half cavity w33. Each wall conductors w18 a whose contact means w19 a has electrical continuity at any instant with surface w38 a of the second aft current shunt w37 a is one of the group of one or more wall conductors comprising second aft wall conductors of the cavity's first half at any instant.

Indicated are said projectile's second half x32 and the second forward current shunt x34 a therein and said shunt's surface x35 a that in the barrel cavity has electrical continuity with the contact means x19 a of the second wall conductor assembly x16 a of the cavity's second half x33. Each wall conductor x18 a whose contact means x19 a at any instant has electrical continuity with said forward current shunt's surface x35 a is one of the group of one or more wall conductors at any instant comprising the second forward wall conductors of the cavity's second half.

Also in the second surface of the second projectile's half x32 is second aft current shunt x37 a and its surface x38 a which when in the barrel cavity has electrical continuity with contact means x19 a the second wall conductor assembly x16 a in the cavity's second half x33. Each wall conductor x18 a whose contact means x19 a has electrical continuity at any instant with surface x38 a of the second aft current shunt x37 a is one of the group of one or more wall conductors comprising the second aft wall conductors of the cavity's second half.

The midline power rail 26 with a projectile in the barrel cavity is in the projectile's guide way 45. Guide way 45 is coincident with the divide plane of the projectile. The midline power rail 26 in guide way 45 has continuous electrical continuity therein with the propulsion bus in each half of the projectile. Said continuities are at the assembly clearance port 32 h in the second side of the collateral projectile at the junction of said propulsion buses.

FIG. 8 is a collateral projectile 32 for collateral cavity 33, disassembled. Indicated are propulsion bus x41 of the projectile's second half x32 which mounts in channel x54 in said projectile's half and extend therein through opening 32 h in the second side of said projectile. When mounted, said propulsion bus's propulsion bus-aft shunt current bus x81 is in channel x82 and aft current shunt x37 a with its surface x38 a is in open channel x52 a in the second side of the projectile's second half x32.

In like manner propulsion bus w41 of the projectile's first half w32 mounts in a channel w54 in said projectile's half and channel w54 intersects and aligns with said channel x54. The propulsion bus-aft shunt current bus w81 is in a mating channel w82 in the projectile's half and second aft current shunt w37 a with its surface w38 a mounts in open channel w52 a in the second side of the projectile's first half.

In the topic design, propulsion bus w41 and propulsion bus x41 meet and are fastened together by pin 42 p through hole w42 h in propulsion bus w41 and hole x42 h in propulsion bus x41 in open channel 32 h at the midpoint of guide way 46 a and their respective surfaces w42 and x42 therein have, when in the barrel cavity, continuous electrical continuity with the cavity surface 27 of midline power rail 26. With the propulsion bus halves mounted, insulating lamina w75 and x75 for the projectile's first and second halves, respectively, cover and electrically insulate the propulsion bus-aft shunt current buses for said halves.

The first aft current shunt w37 mounts in open channel w52 on the first side of the projectile's first half, second forward current shunt w34 a mounts in open channel w50 a in the second side of said projectile's half and the current bus w71 between and connecting said shunts mounts on top of said insulating lamina w75 in channel w70 of end cap w53 in the assembled projectile's first half w32.

In like manner, the first aft current shunt x37 with surface x38 mounts in open channel x52 on the first side of the projectile's second half, second forward current shunt x34 a with surface x35 a mounts in open channel x50 a the second side of said projectile's half and the current bus x71, between and connecting said shunts, mounts on top of said lamina x75 in channel x70 of end cap x53 in the assembled projectile's second half x32.

Also, in the projectile's first half w32, the first forward current shunt w34 with surfaces w35 and w36 mounts in open channel w50 and said channel's extension w50 b in the end cap of said projectile's half and in the projectile's second half x32, the first forward current shunt x34 with surfaces x35 and x36 mounts in open channel x50 and its extension x50 b the end cap of said projectile's half.

FIGS. 9 and 10 are the first and second side, respectively, of the cavity's first half with a projectile's first half therein to demonstrate the current path in one half of the gun. The current path in the gun cavity's second half and projectile's second half therein mimics the path in the first. In the topic figures, the major points along the current path are indicated by the letters: ‘a’, ‘b’, ‘c’,‘d’, ‘e’, ‘f’, ‘g’, ‘h’, ‘i’, ‘y’, ‘k’, ‘m’, ‘n’, ‘o’, ‘p’, ‘q’, ‘r’, ‘s’, ‘t’, ‘u’ and ‘v’ Looking to FIG. 9, the narrow wall power rail w29 is first taken as positive with reference the midline power rail 26; i.e. the current lug 31 is connected to the positive terminal of an outside power supply and current lug 28 is connected to the return terminal of said power supply. Current is from input lug 31 (‘a’ in the figure) through current bus branch w31 and therefrom to said power rail w29 (see also FIG. 2).

The current in power rail w29 has muzzle direction to ‘b’ in FIG. 9 whereat it has continuous electrical continuity with the first forward current shunt w34 of the first cavity half via the continuous electrical continuity of said shunt's surface w36 with barrel cavity surface w30 of power rail w29. The magnetic fields of the current in barrel power rail w29 interact with the current in the projectile's propulsion bus w41 creating forces therein with muzzle directed, cavity axis parallel components.

The magnetic fields of current in power rail w29 at radii beyond the midline power rail 26 interact with the current in the propulsion bus x41 in the projectile's second half creating forces therein with breech directed, cavity axis parallel components. In like manner, the magnetic fields of the current in the narrow wall power rail x29 in the cavity's second half interact with the current in propulsion bus w41 of the projectile's first half also creating forces therein with breech directed, cavity axis parallel components. Said breech directed force components in the propulsion bus w41 due to the magnetic fields of the current in the narrow wall power rail x29 of the cavity's second half are smaller then the muzzle directed force components due to the magnetic fields of the current in the narrow wall power rail w29.

The current continues from power rail w29 via the first forward current shunt surface w36, ‘c’ in the figure, and surface w35, ‘d’ in the figure, to the group of one or more wall conductors w18 comprising the first forward wall conductors of said cavity's first half [i.e. the forward wall conductors of the first wall conductor assembly w16 of said cavity's half] which have electrical continuity, via their contact means w19, with said forward current shunt surface w35 at any instant.

The current in the forward wall conductors of said first wall conductor assembly w16 is barrel bus directed from ‘e’ to ‘f’ in FIG. 9; i.e. the current's direction is toward the cavity's divide plane. The magnetic fields of the currents in the first forward wall conductors w18 in the cavity's first half w33 interact with the current in propulsion bus w41 of the projectile's first half w32 creating forces therein with cavity axis parallel, muzzle directed components.

The current continues from the first forward wall conductors to the barrel bus w17 of the first wall conductor assembly w16 of the cavity's first half and therein has breech direction; i.e. the current's direction is from ‘f’ to ‘g’ in the FIG. 9. The magnetic fields of the current in barrel bus w17 interacts with the current in the propulsion bus w41 of the projectile's first half creating forces therein with cavity axis, muzzle directed components.

The magnetic fields of the current in barrel bus w17 also interacts with the current in the propulsion bus x41 of the projectile's second half x32 also creating therein forces with cavity axis parallel, muzzle directed components.

In like manner the magnetic fields of currents in the barrel buses x17 and x17 a of the first and second wall conductor assembles, respectively, in the cavity's second half interact with the current in the propulsion bus w41 of the projectile's first half creating additional forces in said propulsion bus with cavity axis parallel muzzle directed components.

Current continues from barrel bus w17 to the first aft wall conductors of the cavity's first half; i.e. current continues from g to h in FIG. 9. Said aft wall conductors are the group of one or more wall conductors w18 which have via their contact means w19, at any instant, electrical continuity with the surface w38 (‘i’ in the figure) of the first aft current shunt w37 of the projectile's first half w32. The magnetic fields of currents in said first aft wall conductors interact with the current in propulsion bus w41 creating in said propulsion bus forces with cavity axis parallel, muzzle directed components.

The current continues from surface w38 of the first aft current shunt w37 to surface w35 a of the second forward current shunt w34 a via the projectile's aft shunt-forward shunt current bus w71; i.e. the current continues from ‘i’ to ‘j’ to ‘k’ to ‘l’ in the figures.

The current continues in the second forward wall conductors of the cavity's first half [i.e. the forward wall conductors of the second wall conductor assembly w16 a in the cavity's first half] towards said assembly's barrel bus; i.e. current continues from ‘m’ to ‘n’ in FIG. 10. Said second forward wall conductors are the group of one or more wall conductors w18 a of the second wall conductor assembly w16 a, which have at any instant via their contact means w19 a, electrical continuity with surface w35 a the second forward current shunt w34 a. The magnetic fields of the currents in the second forward wall conductors of the cavity's first half interact with the current in the propulsion bus w41 in the projectile's first half creating forces in said propulsion bus with cavity axis parallel, muzzle directed components.

The current continues from the second forward wall conductors of the cavity's first half w33 to the second wall conductor assembly's barrel bus w17 a wherein it has breech direction; current continues from ‘n’ to ‘o’ in FIG. 10. The magnetic fields of the current in barrel bus w17 a interact with the current in the propulsion bus w41 of the projectile's first half w35 creating forces in said propulsion bus with cavity axis parallel, muzzle directed components. Said magnetic fields also interact with the current in the propulsion bus x41 of the projectile's second half x32 also creating forces in propulsion bus x41 with cavity axis parallel, muzzle directed components.

The current continues from the second wall conductor assembly's barrel bus w17 a to the second aft wall conductors of the cavity's first half [i.e. aft wall conductors w18 a of the second wall conductor assembly w16 a] and therein towards said cavity half's narrow wall of; i.e. current continues from ‘o’ to ‘p’ to ‘q’ in FIG. 10. The second aft wall conductors of the cavity's first half [i.e. aft wall conductors of the second wall conductor assembly in the cavity's first half w33] are comprised of the group of one or more wall conductors w18 a of the second wall conductor assembly w16 a which have at any instant, via their contact means w19 a, electrical continuity with surface w38 a of the second aft current shunt w37 a. magnetic fields of the currents in the second aft wall conductors of the cavity's first half w33 interact with the current in the propulsion bus w41 of the projectile's first half creating in said bus forces with cavity axis parallel, muzzle directed components.

Current continues from the second aft current shunt w37 a to the propulsion bus w41 of the projectile's first half w32 via the propulsion bus-aft shunt current bus w81; current continues from ‘q’, at aft shunt surface w38 a, ‘r’, at the propulsion bus-aft shunt current bus w81, to ‘s’ at the junction of said current bus with the propulsion bus w41 in FIG. 10. The current continues in propulsion bus w41 from proximal the narrow wall power rail w29 toward the midline power rail 26 whose cavity surface 27 has continuous electrical continuity with said propulsion bus's surface w42 at said midline power rail; i.e. current continues from ‘s’ to ‘t’ in FIG. 10.

The current continues from propulsion bus w41 to the midline power rail 27 and therein has breech direction to said rail's lug 28 to outside the barrel; i.e. current continues from ‘u’ to ‘v’ at the rail's lug 28 outside the barrel. The magnetic fields of the current in the midline power rail 26 interact with the current in propulsion bus w41 creating forces in said propulsion bus with cavity axis parallel, muzzle directed components. Lug 28 is connected to the return terminal of the outside power supply. The magnetic fields of the current in the midline power rail also interacts with propulsion bus x41 of the projectile's second half creating in propulsion bus x41 forces with cavity axis parallel, muzzle directed components.

The current in propulsion bus w41 is acted on by the magnetic fields of the currents in the forward and aft wall conductors of the first and second wall conductor assembles of the cavity's first half, the magnetic fields of the currents in the barrel buses of the first and second wall conductor assembles of the first and second cavity halves, the magnetic fields of the currents in the midline power rail and the magnetic fields of the current in the narrow wall power rail in the cavity's first half, creating forces in the propulsion bus with cavity axis parallel, muzzle directed components. The magnetic field of the narrow wall power rail in the cavity's second half interacts with the current in propulsion bus w41 creating a much smaller projectile acceleration retarding force in said propulsion bus with breech directed, cavity axis parallel components.

With power lug 28 of the midline power rail 26 connected to the positive terminal of an outside power supply and the power lug 31 of barrel bus distal power rails w29 and x29 connected to the return terminal of the outside power supply, the current in the midline power rail 26 is muzzle directed and its magnetic fields interact with the current in the propulsion bus w41 of the projectile's first half creating forces in said propulsion bus with cavity axis parallel, muzzle directed components; i.e. the currents direction in FIG. 10 current is from ‘v’ to ‘u’.

The current continues from the midline power rail 26 to the propulsion bus w41 of the projectile's first half via the continuous electrical continuity of said rail's surface 27 with surface w42 of said propulsion bus. The current continues in propulsion bus w41 towards the narrow wall of the cavity's first half; i.e. the current is from ‘t’ to ‘s’ in FIG. 10. The current in propulsion bus w41 is acted on by the magnetic fields of the current in its surrounding circuit elements noted above.

The current continues from the propulsion bus w41 through the propulsion bus-aft shunt current bus w81 towards the breech to second aft current shunt w38 a; i.e. the current is from ‘s’ to ‘r’ to ‘q’ in said figure.

The current continues from the second aft current shunt w37 a to the second aft wall conductors of the first cavity's half and therein continues towards the barrel bus w17 a of the second wall conductor assembly w16 a of said cavity's half; i.e. the current continues from ‘q’ to ‘p’ to ‘o’ in FIG. 10. The magnetic fields of the currents in said second aft wall conductors interact with the current in the propulsion bus w41 creating forces therein with cavity axis parallel, muzzle directed components.

The current continues from the second aft wall conductors of said cavity's half [i.e. the aft wall conductors w18 a of the second wall conductor assembly w16 a] to the barrel bus w17 a of the second wall conductor assembly w16 a and in said barrel bus has muzzle direction; i.e. the current continues from ‘o’ to ‘n’ in said barrel bus. The magnetic fields of the current in said barrel bus interacts with the currents in the propulsion buses of the first and second halves of the projectile, w41 and x41 respectively, creating therein forces with cavity axis parallel, muzzle directed components.

The current continues from the barrel bus of the second wall conductor assembly of the cavity's first half to the second forward wall conductors of the cavity's first half and therein is directed towards the narrow wall of said cavity's half; i.e. the current continues from ‘n’ to ‘m’ in FIG. 10. The magnetic fields of the currents in said second forward wall conductors interacts with the current in the propulsion bus w41 creating therein forces with cavity axis parallel, muzzle directed components.

The current continues from the second forward wall conductors of said cavity's first half to the second forward current shunt w34 a of the projectile's first half w32 therein and then through the aft shunt-forward shunt current bus w71 of said projectile's half to the first aft current shunt w37 of said projectile's half; i.e. the current continues from ‘m’ to ‘l’ to ‘k’ to ‘j’ in FIG. 10 and on to ‘i’ in FIG. 9.

The current continues in the first aft wall conductors of the cavity's first half [i.e. the aft wall conductors of the first wall conductor assembly w16] towards their assembly's barrel bus; i.e. the current continues from ‘i’ to ‘h’ to ‘g’ in FIG. 9. The magnetic fields of the currents in said fist aft wall conductors interact with the current in the propulsion bus w41 creating forces in said propulsion bus with cavity axis parallel, muzzle directed components.

The current continues from said first aft wall conductors to the barrel bus w17 of the first wall conductor assembly w16 and therein has muzzle direction; i.e. the current continues from ‘g’ to ‘f’ in FIG. 9. The magnetic fields of the current in said barrel bus interacts with the currents in the propulsion buses in the projectile's first and second halves creating in said buses forces with cavity axis parallel, muzzle directed components.

The current continues from said barrel bus to the first forward wall conductors of the cavity's first half and continues therein towards the narrow wall power rail w29 of said cavity's half; i.e. the current continues from ‘f’ to ‘e’ in FIG. 9. The magnetic fields of the currents in said first forward wall conductors interact with the current in the propulsion bus of the first projectile's half creating in said propulsion bus forces with cavity axis parallel, muzzle directed components.

The current continues from said fist forward wall conductors through the first forward current shunt of the projectile's first half to the narrow wall power rail w29 in the cavity's first half; i.e. the current continues from ‘e’ to ‘d’ to ‘c’ to ‘b’ in FIG. 9. The current continues in power rail w29 towards the breech and therefrom via lug 31 to the return terminal of the outside power supply; i.e. the current continues from ‘b’ to ‘a’ in FIG. 9. The magnetic fields of the current in power rail w29 interact with the current in the propulsion bus w41 creating forces in said propulsion bus with cavity axis parallel, muzzle directed components and said magnetic fields also interact with the current in propulsion bus x41 of the projectile's second half creating forces therein with cavity axis parallel, breech directed components.

Generally, regardless the polarity of the current lugs 28 and 31 relative to each other, the direction of current in the first and second forward wall conductors of a cavity's half [i.e. the forward wall conductors of the first and second wall conductor assembles in each cavity half] is the same as the current in the propulsion bus in the respective projectile's half. The direction of current in the first and second aft wall conductors of a cavity's half [i.e. the aft wall conductors of the first and second wall conductor assembles in each cavity half] is opposite the current direction in propulsion bus in the projectile's respective half. The current direction in the barrel buses of the first and second wall conductor assembles of the first and second cavity halves is the same as in the midline power rail. The current direction in the narrow wall power rails in each cavity's half cavities are the same and the same as the current direction in the proximal current buses in the projectile and opposite the current direction in the midline power rail and the barrel buses of the first and second wall conductor assembles of the first and second half cavities.

FIG. 11 illustrates a means for retaining a projectile in the barrel's breach prior to use. In the device, a fuse pin is used to retain the projectile at the breach end of the barrel cavity until sufficient current is supplied to the power rail lugs to vaporize the fuse pin and release the projectile for acceleration in the barrel cavity toward the muzzle. This arrangement is particularly suitable for one shot disposable cartridge type guns.

In FIG. 11, fuse pin 65 is in clearance hole 58 in breech end cap 6 and in said hole, fuse pin 65 is fastened at hole 28 h in extension 28 e of power lug 28 of midline power rail 27 with good electrical continuity. The fuse pin passes from hole 28 h through clearance channel 161 in cleat 160 at the breech end of projectile 32 to hole 31 h in extension 31 e of power lug 31 in breach cap 6 where said fuse pin is also fastened with good electrical continuity.

Although the invention has been described herein with reference to the presently preferred embodiments, a great number of modifications, changes and alterations including alternative configurations of said embodiments are possible without departing from the spirit and scope of the invention as defined in the appended claims and equivalents thereof. 

1. Electromagnetic propulsion guns comprising: a barrel; and a narrow cavity therein which extends the length of said barrel and having: a uniform right section profile throughout its length, and a breech end opening at one end of said barrel, and a muzzle end opening at the other end of said barrel, and two narrow walls located across the cavity from each other, and a first and second broad wall located across the cavity from each other and extending between and adjoining said narrow walls, and said narrow walls, said broad walls, said breech end opening, and said muzzle end opening as boundaries, and a central axis extending between said breech end opening and said muzzle end opening which is parallel to said walls, and a midline in said first broad wall divide said wall into two equal half wall parts which extend the length of said cavity, and a midline in said second broad wall divide said wall into two equal half wall parts which extend the length of said cavity and said midline is parallel said first broad wall's midline, and two equal collateral halves extending the length of said barrel's cavity with boundaries of each said cavity's collateral half as: a narrow cavity wall, and said cavity's two broad wall halves adjoining said narrow cavity wall, and said cavity's muzzle end, and said cavity's breech end, and the divide plane coincident each said broad wall's midline, and wherein: the first wall of the cavity's first collateral half is said half wall part of said first broad wall at said cavity's first collateral half, and the first wall of the cavity's second collateral half is said half wall part of said first broad wall at said cavity's second collateral half, and the second wall of the cavity's first collateral half is said half wall part of said second broad wall at said cavity's first collateral half, and the second wall of the cavity's second collateral half is said half wall part of said second broad wall at said cavity's second collateral half; and three barrel rails that: are power rails and parallel to each other and extend from proximal said cavity's breech end opening to proximal said cavity's muzzle end opening, and have continuous barrel cavity surface along their lengths and have power connection means proximal their breech ends to outside the device for attachment to outside power source, and two of said power rails are narrow wall power rails located across the cavity from each other, at, in, or proximal the narrow end walls of said barrel cavity, and the third said power rail is the midline power rail located at the midline of said cavity's second broad wall, and during said gun's operation, said narrow wall power rails have the same polarity with reference said midline power rail; and a first wall conductor assembly located in said first wall of said cavity's first collateral half and a first wall conductor assembly located in said first wall of said cavity's second collateral half and each said first wall conductor assembly comprising: a barrel bus which is: in said first wall with said assembly, and adjacent, parallel and in close proximity said midline of said cavity's first broad wall, and proximal and electrically isolated from said barrel bus of said first wall conductor assembly of the cavity's other collateral half, and a wall conductor array which: is in said first wall with said assembly and is proximal or at the cavity surface of said first wall, and each wall conductor of said array: is parallel to each other, and is spaced from each other, and is orthogonal said cavity's central axis, and has at one end, electrical continuity with said barrel bus and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with said conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and a second wall conductor assembly located in said second wall of said cavity's first collateral half, and a second wall conductor assembly located in said second wall of said cavity's second collateral half, and each said second wall conductor assembly comprising: a barrel bus which is: in said second wall with said assembly and adjacent, parallel, in close proximity and electrically isolated from said midline power rail and said barrel bus of the second wall conductor assembly of the cavity's other collateral half, and a wall conductor array which: is in said second wall with said assembly, and is proximal or at the barrel cavity surface of said wall, and each wall conductor of said array: is parallel to each other, and is spaced from each other, and is orthogonal said cavity's axis, and has at one end, electrical continuity with said barrel bus, and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with its wall conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and projectiles for propulsion through said barrel cavity and each said projectile having: a central axis that is, with said projectile in said barrel cavity, coincident or very close and parallel said cavity's central axis, and a muzzle end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's muzzle end opening, and a breech end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's breech end opening and, a first broad surface on one side, and a second broad surface on its side lateral said first side, and a midline in each said broad surface extending between said projectile's breech and muzzle ends, and dividing each said broad surface into two equal areas, and a divide plane coincident with said broad surfaces' midlines divide said projectile into a first collateral half and a second collateral half, and, wherein: said equal area of said first broad surface in said projectile's first collateral half is the first surface of said first collateral half and said equal area of said first broad surface in said projectile's second collateral half is the first surface of said second collateral half and said equal area of said second broad surface in said projectile's first collateral half is the second surface of said first collateral half and said equal area of said second broad surface in said projectile's second collateral half is the second surface of said second collateral half, and, with said projectile in said barrel's cavity, said projectile's: midlines, divide plane, and central axis are coincident or very close and parallel said cavity's divide plane, and first collateral half is in said barrel cavity's first collateral half, and second collateral half is in said barrel cavity's second collateral half, and said first surface of its first collateral half is proximal said first wall of the cavity's first collateral half, and said second surface of its first collateral half is proximal said second wall of the cavity's first collateral half, and said first surface of its second collateral half is proximal said first wall of the cavity's second collateral half and said second surface of its second collateral half is proximal said second wall of the cavity's second collateral half; and a propulsion bus in each said collateral half of each said projectile, and each said propulsion bus: is located midway between the projectile's muzzle and breech ends, and is oriented orthogonal said projectile's central axis, and extends from proximal said divide plane of said projectile, whereat it has surface that has, with said projectile in said barrel cavity, continuous electrical continuity with said midline power rail's cavity surface to proximal the edge of said projectile's collateral half that is distal said projectile's divide plane and whereat said propulsion bus has continuous electrical continuity with the propulsion bus-aft shunt current bus in said projectile's collateral half, and each said projectile's collateral half has: a first forward current shunt that: is located in said collateral half's first surface between the propulsion bus of said collateral half and the muzzle end of the projectile, and, with said projectile in the barrel cavity, is proximal the narrow wall power rail of the cavity's collateral half with said projectile's collateral half, and has surface that has continuous electrical continuity with said cavity surface of said narrow power rail, and has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said forward shunt's surface at any instant; and each said projectile's collateral half has: a first aft current shunt that: is located in said first surface of said collateral half between the propulsion busof said collateral half and the breech end of said projectile, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and, with said projectile in said barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and, has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said aft current shunt's surface at any instant; and each said projectile's collateral half has: a second forward current shunt that: is located in said second surface of said projectile's collateral half between said propulsion bus and the muzzle end of the projectile, and is lateral said first forward current shunt of said collateral half, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and, with said projectile in the barrel's cavity, is proximal the narrow wall of said cavity's collateral half with said projectile's collateral half, and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said second forward current shunt's surface at any instant; and each said projectile's collateral half has: a second aft current shunt that: is located in said second surface of said projectile's collateral half between the propulsion bus of said collateral half and the breech end of said projectile, and has continuous electrical continuity with the propulsion bus-aft shunt current bus of said projectile's collateral half, and, with said projectile in said barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said aft current shunt's surface at any instant; and said aft shunt-forward shunt current bus in each collateral half of said projectile between and connecting the first aft current shunt and the second forward current shunt of said projectile's collateral half, and proximal said current shunts in said collateral half; and said propulsion bus-aft shunt current bus in each collateral half of said projectile between and connecting the second aft current shunt and the propulsion bus of said projectile's collateral half, proximal said current shunts in said collateral half.
 2. Electromagnetic propulsion guns as claimed in claim 1 wherein the projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail, and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied to the power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity.
 3. Electromagnetic propulsion guns as claimed in claim 1 wherein the projectile is retained at the breech end of the barrel's cavity for release and propulsion in said cavity towards the barrel's muzzle on application of sufficient power to the power rails.
 4. Electromagnetic propulsion guns as claimed in claim 3 wherein the projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied to the power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity.
 5. Electromagnetic propulsion guns comprising: a barrel; and a narrow cavity therein which extends the length of said barrel and having: a uniform right section profile throughout its length, and a breech end opening at one end of said barrel, and a muzzle end opening at the other end of said barrel, and two narrow walls located across the cavity from each other, and a first and second broad wall located across the cavity from each other and extending between and adjoining said narrow walls and said narrow walls, said broad walls, said breech end opening, and said muzzle end opening as boundaries, and a central axis extending between said breech end opening and said muzzle end opening which is parallel to said walls, and a midline in said first broad wall divide said wall into two equal half wall parts which extend the length of said cavity, and a midline in said second broad wall divide said wall into two equal half wall parts which extend the length of said cavity and said midline is parallel said first broad wall's midline ,and ’two equal collateral halves extending the length of said barrel's cavity with boundaries of each said cavity's collateral half: a narrow cavity walls, and the cavity's two broad wall halves adjoining said narrow cavity wall, and the cavity's muzzle end, and the cavity's breech end, and the divide plane coincident both said broad wall's midlines and wherein the first wall of the cavity's first collateral half is said half wall part of said first broad wall at said cavity's first collateral half and the first wall of the cavity's second collateral half is said half wall part of said first broad wall at said cavity's second collateral half and the second wall of the cavity's first collateral half is said half wall part of said second broad wall at said cavity's first collateral half and the second wall of the cavity's second collateral half is said half wall part of said second broad wall at said cavity's second collateral half; and three barrel rails which: are power rails and parallel to each other and extend from proximal said cavity's breech end to proximal said cavity's muzzle end, and have continuous barrel cavity surface along their lengths and have power connection means proximal their breech ends to outside the device for attachment to an outside power source; and two of said power rails are narrow wall power rails located across the cavity from each other, at, in, or proximal the narrow end walls of said barrel cavity, and the third said power rail is the midline power rail located at the midline of the cavity's second broad wall, and during said gun's operation, said narrow wall power rails have the same polarity with reference said midline power rail; and a first wall conductor assembly located in said first wall of said cavity's first collateral half, and a first wall conductor assembly located in said first wall of said cavity's second collateral half, and each said first wall conductor assembly comprising: a barrel bus which is: in said first wall with said assembly, and adjacent, parallel and in close proximity said midline of said cavity's first broad wall, and proximal and electrically isolated from said barrel bus of said first wall conductor assembly of the cavity's other collateral half, and an array of wall conductors which are: in said first wall with said assembly and proximal or at the cavity surface of said first wall and parallel to each other, and spaced from each other, and orthogonal said cavity's central axis, and each wall conductor of said array: has at one end, electrical continuity with said barrel bus and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with its wall conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and a second wall conductor assembly located in said second wall of said cavity's first collateral half, and a second wall conductor assembly located in said second wall of said cavity's second collateral half, and each said second wall conductor assembly comprising: a barrel bus which is: in said second wall with said assembly and adjacent, parallel, in close proximity and electrically isolated from said midline power rail and the barrel bus of the second wall conductor assembly of the cavity's other collateral half, and an array of wall conductors which are: in said second wall with said assembly, and proximal or at the barrel cavity surface of said wall, and parallel to each other, and spaced from each other, and orthogonal said cavity's axis, and each wall conductor of said array: has at one end, electrical continuity with said barrel bus, and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with its wall conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and projectiles for propulsion through said barrel cavity and each said projectile having: a central axis that is, with said projectile in said barrel cavity, coincident or very close and parallel said cavity's central axis, and a muzzle end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's muzzle end and a breech end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's breech end and, a first broad surface on one side, and a second broad surface on its side lateral said first side, and a midline in each said broad surface extending between said projectile's breech end and muzzle end, and dividing each said broad surface into two equal areas, and the divide plane which is coincident with both said midlines divide said projectile into a first collateral half and a second collateral half, and, wherein said equal area of said first broad surface in said projectile's first collateral half is the first surface of said first collateral half and said equal area of said first broad surface in said projectile's second collateral half is the first surface of said second collateral half and said equal area of said second broad surface in said projectile's first collateral half is the second surface of said first collateral half and said equal area of said second broad surface in said projectile's second collateral half is the second surface of said second collateral half, and, with said projectile in said barrel's cavity, said projectile's: midlines, divide plane, and central axis are coincident or very close and parallel said cavity's divide plane, and first collateral half is in said barrel cavity's first collateral half, and second collateral half is in said barrel cavity's second collateral half, and said first surface of its first collateral half is proximal the first wall of the cavity's first collateral half, and second surface of its first collateral half is proximal the second wall of the cavity's first collateral half, and first surface of its second collateral half is proximal the first wall of the cavity's second collateral half and second surface of its second collateral half is proximal the second wall of the cavity's second collateral half; and a propulsion bus in each said collateral half of each said projectile, and each said propulsion bus: is located midway between the projectile's muzzle and breech ends and is oriented orthogonal said projectile's central axis, and extends from proximal said divide plane of said projectile, whereat it has surface that has, with the projectile in the barrel's cavity, continuous electrical continuity with said midline power rail's cavity surface, to proximal the edge of said projectile's collateral half that is distal the projectile's divide plane and whereat said propulsion bus has continuous electrical continuity with the propulsion bus-aft shunt current bus in said projectile's collateral half; and a first forward current shunt in each said projectile's collateral half that: is located in said collateral half's first surface between the propulsion bus of said collateral half and the muzzle end of the projectile, and, with the projectile in the barrel cavity, is proximal the narrow wall power rail of the cavity's collateral half with said projectile's collateral half and has surface that has continuous electrical continuity with said cavity surface of said narrow power rail, and has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said forward shunt's surface at any instant; and said first wall conductor assembly of a collateral half of said barrel's cavity has additionally, with the projectile in the barrel cavity, the first forward wall conductors of said barrel cavity's collateral half comprised of the group of one or more consecutive wall conductors of said first wall conductor assembly whose contact means at any instant have said electrical continuity with said first forward current shunt; and said first forward current shunt of a collateral half of a projectile in the barrel cavity, via said shunt's continuous electrical continuity with said narrow wall power rail and said first forward wall conductors of said cavity's collateral half, maintains continuous electrical continuity between said narrow wall power rail and said first forward wall conductors of said cavity's collateral half; and a first aft current shunt in each said collateral half of said projectile that: is located in said first surface of said projectile's collateral half between the propulsion bus of said collateral half and the breech end of said projectile, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and with the projectile in the barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and, has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said aft current shunt's surface at any instant; and said first wall conductor assembly of a barrel's collateral half has additionally, with the projectile in the barrel cavity, the first aft wall conductors of said barrel's collateral half comprised of the group of one or more consecutive wall conductors of said first wall conductor assembly whose contact means at any instant have electrical continuity with said first aft current shunt; and said first aft current shunt of a projectile's collateral half in the barrel cavity, via said shunt's continuous electrical continuity with said aft shunt-forward shunt current bus and said first aft wall conductors of said cavity's collateral half, maintains continuous electrical continuity between said aft shunt-forward shunt current bus and said first aft wall conductors of said cavity's collateral half; and, said barrel bus of said first wall conductor assembly in each barrel cavity's collateral half, with a projectile in the barrel cavity, maintains continuous electrical continuity between said first forward wall conductors and said first aft wall conductors of said cavity's collateral half; and a second forward current shunt in each said collateral half of said projectile that: is located in said second surface of said projectile's collateral half between said propulsion bus and the muzzle end of the projectile, and is lateral said first forward current shunt of said collateral half, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and, with the projectile in the barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half, and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said second forward current shunt's surface at any instant; and said second wall conductor assembly of a barrel's collateral half has additionally, with the projectile in the barrel cavity, the second forward wall conductors of said barrel cavity' collateral half comprising the group of one or more consecutive wall conductors of said second wall conductor assembly whose contact means at any instant have electrical continuity with said second forward current shunt; and said second forward current shunt of a collateral half of a projectile in the barrel cavity, via said shunt's continuous electrical continuity with said aft shunt-forward shunt current bus and said second forward wall conductors of the barrel cavity's collateral half, maintains continuous electrical continuity between said aft shunt-forward shunt current bus and said second forward wall conductors; and a second aft current shunt in each said collateral half of said projectile that: is located in said second surface of said projectile's collateral half between the propulsion bus of said collateral half and the breech end of said projectile, and has continuous electrical continuity with the propulsion bus-aft shunt current bus of said projectile's collateral half, and, with said projectile in said barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said aft current shunt's surface at any instant; and said second wall conductor assembly of a barrel's collateral half has additionally, with a projectile in the barrel cavity, the second aft wall conductors of said cavity's collateral half comprising the group of one or more consecutive wall conductors of said second wall conductor assembly whose contact means at any instant have electrical continuity with said second aft current shunt; and said second aft current shunt of each collateral half of said projectile in its respective cavity's collateral half, via said shunt's continuous electrical continuity with said second aft wall conductors of said barrel's collateral half and said propulsion bus-aft shunt current bus of said projectile's collateral half, maintains continuous electrical continuity between said second aft wall conductors and said propulsion bus-aft shunt current bus; and said barrel bus of said second wall conductor assembly in each barrel cavity's collateral half, with a projectile in the barrel cavity, maintains continuous electrical continuity between the second forward wall conductors and the second aft wall conductors of said cavity's collateral half; and said aft shunt-forward shunt current bus in each collateral half of a projectile is between and connects the first aft current shunt and the second forward current shunt of said projectile's collateral half, and is proximal said current shunts in said collateral half, and said aft shunt-forward shunt current bus of a projectile's collateral half in its cavity's collateral half, maintains continuous electrical continuity between said first aft wall conductors of said barrel cavity's collateral half, via the continuous electrical continuity of said wall conductors with said first aft current shunt of said projectile's collateral half, and said the second forward wall conductors of said cavity's collateral half, via the continuous electrical continuity of said wall conductors with said second forward current shunt of said projectile's collateral half; and said propulsion bus-aft shunt current bus in each collateral half of a projectile is between and connects the second aft current shunt and the propulsion bus of said collateral half and is proximal said current shunts in said collateral half, and said propulsion bus-aft shunt current bus of a projectile's collateral half, when in its respective collateral half of the barrel cavity, maintains continuous electrical continuity between the propulsion bus of said projectile's collateral half and the second aft wall conductors of said barrel's collateral half, via said wall conductors continuous electrical continuity with the second aft current shunt of said projectile's collateral half.
 6. Electromagnetic propulsion guns as claimed in claim 5 wherein the projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied to the power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity.
 7. Electromagnetic propulsion guns as claimed in claim 5 wherein the projectile is retained at the breech end of the barrel's cavity for release and propulsion in said cavity towards the barrel muzzle on application of sufficient power to the power rails.
 8. Electromagnetic propulsion guns as claimed in claim 7 wherein a projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied to the power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity.
 9. Electromagnetic propulsion guns comprising: a barrel; and a narrow cavity therein which extends the length of said barrel and having: a uniform right section profile throughout its length, and a breech end opening at one end of said barrel, and a muzzle end opening at the other end of said barrel, and two narrow walls located across the cavity from each other, and a first and second broad wall located across the cavity from each other and extending between and adjoining said narrow walls and said narrow walls, said broad walls, said breech end opening, and said muzzle end opening as boundaries, and a central axis extending between said breech end opening and said muzzle end opening which is parallel to said walls, and a midline in said first broad wall divide said wall into two equal half wall parts which extend the length of said cavity, and a midline in said second broad wall divide said wall into two equal half wall parts which extend the length of said cavity and said midline is parallel said first broad wall's midline, and two equal collateral halves extending the length of said barrel's cavity and each said collateral half having boundaries of: a narrow cavity walls, and the cavity's two broad wall halves adjoining said narrow cavity wall, and the cavity's muzzle end, and the cavity's breech end, and the divide plane coincident with both said broad wall's midlines, and wherein said half wall part of said first broad wall at said cavity's first collateral half is the first wall of the cavity's first collateral half, and said half wall part of said first broad wall at said cavity's second collateral half is the first wall of the cavity's second collateral half, and said half wall part of said second broad wall at said cavity's first collateral half is the second wall of the cavity's first collateral half, and said half wall part of said second broad wall at said cavity's second collateral half is the second wall of the cavity's second collateral half; and three barrel rails that: are power rails and parallel to each other and extend from proximal said cavity's breech end to proximal said cavity's muzzle end, and have continuous barrel cavity surface along their lengths and have power connection means proximal their breech ends to outside the gun for attachment to an outside power source, and includes two of said power rails as narrow wall power rails located across the cavity from each other, at, in, or proximal the narrow end walls of said barrel cavity, and the third said power rail as the midline power rail located at the midline of the cavity's second broad wall, and during said gun's operation, said narrow wall power rails have the same polarity with reference said midline power rail; and a first wall conductor assembly located in said first wall of said cavity's first collateral half, and a first wall conductor assembly located in said first wall of said cavity's second collateral half, and each said first wall conductor assembly comprising: a barrel bus which is: in said first wall with said assembly, and adjacent, parallel and in close proximity said midline of said cavity's first broad wall, and proximal and electrically isolated from said barrel bus of said first wall conductor assembly of the cavity's other collateral half, and an array of wall conductors which are: in said first wall with said assembly and proximal or at barrel cavity surface of said first wall and parallel to each other, and spaced from each other, and orthogonal said cavity's central axis, and each wall conductor of said array: has at one end, electrical continuity with said barrel bus and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with its wall conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and a second wall conductor assembly located in said second wall of said cavity's first collateral half, and a second wall conductor assembly located in said second wall of said cavity's second collateral half, and each said second wall conductor assembly comprising: a barrel bus which is: in said second wall with said assembly and adjacent, parallel, in close proximity and electrically isolated from said midline power rail and proximal the barrel bus of the second wall conductor assembly of the cavity's other collateral half, and an array of wall conductors which are: in said second wall with said assembly, and proximal or at the barrel cavity surface of said wall, and parallel to each other, and spaced from each other, and orthogonal said cavity's axis, and each wall conductor of said array: has at one end, electrical continuity with said barrel bus, and extends from proximal said barrel bus to proximal the narrow cavity wall of the cavity's collateral half with said assembly, and contact means for each wall conductor of said array of wall conductors and each said contact means: is located proximal its wall conductor's barrel bus distal end, and has electrical continuity with its wall conductor thereat, and is in a mating opening thereat into the barrel cavity, and has surface in the barrel cavity; and projectiles for propulsion through said barrel cavity and each said projectile having: a central axis that is, with said projectile in said barrel cavity, coincident or very close and parallel said cavity's central axis, and a muzzle end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's muzzle end and a breech end that is, with said projectile in said barrel cavity, said projectile's end closest said cavity's breech end and, a first broad surface on one side, and a second broad surface on its side lateral said first side, and a midline in each said broad surface extending between said projectile's breech end and muzzle end, and dividing each said broad surface into two equal areas, and the divide plane coincident with both said midlines divide said projectile into a first collateral half and a second collateral half, and, wherein said equal area of said first broad surface in said projectile's first collateral half is the first surface of said first collateral half and said equal area of said first broad surface in said projectile's second collateral half is the first surface of said second collateral half and said equal area of said second broad surface in said projectile's first collateral half is the second surface of said first collateral half and said equal area of said second broad surface in said projectile's second collateral half as the second surface of said second collateral half, and, with said projectile in said barrel's cavity, said projectile's midlines, divide plane, and central axis are coincident or very close and parallel said cavity's divide plane, and its first collateral half is in said cavity's first collateral half, and its second collateral half is in said cavity's second collateral half, and its first surface of its first collateral half is proximal the first wall of the cavity's first collateral half, and its second surface of its first collateral half is proximal the second wall of the cavity's first collateral half, and its first surface of its second collateral half is proximal the first wall of the cavity's second collateral half, and its second surface of its second collateral half is proximal the second wall of the cavity's second collateral half, and a propulsion bus in each said collateral half, and each said propulsion bus is located midway between said projectile's muzzle and breech ends and is oriented orthogonal said projectile's central axis, and extends from proximal said divide plane of said projectile whereat it has surface that has, with said projectile in said barrel cavity, continuous electrical continuity with said midline power rail's cavity surface, to proximal the edge of said projectile's collateral half that is distal the projectiles divide plane and whereat said propulsion bus has continuous electrical continuity with the propulsion bus-aft shunt current bus in said projectile's collateral half, and a first forward current shunt in each said collateral half that: is located in said collateral half's first surface between the propulsion bus of said collateral half and the muzzle end of the projectile and with the projectile in the barrel cavity, is proximal the narrow wall power rail of the cavity's collateral half with said projectile's collateral half and has surface that has continuous electrical continuity with said cavity surface of said narrow power rail, and has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said forward shunt's surface at any instant, and a first aft current shunt in each said collateral half that: is located in said first surface of said collateral half between the propulsion bus of said collateral half and the breech end of said projectile, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and with the projectile in the barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and, has surface at and that has continuous electrical continuity with said first wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said first aft current shunt's surface at any instant, and a second forward current shunt in each said collateral half that: is located in said second surface of said projectile's collateral half between said propulsion bus and the muzzle end of said projectile, and lateral said first forward current shunt of said collateral half, and has continuous electrical continuity with the aft shunt-forward shunt current bus of said projectile's collateral half, and, with the projectile in the barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half, and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said second forward current shunt's surface at any instant, and a second aft current shunt in each said collateral half that: is located in said second surface of said projectile's collateral half between the propulsion bus of said collateral half and the breech end of said projectile, and has continuous electrical continuity with the propulsion bus-aft shunt current bus of said collateral half, and, with said projectile in said barrel's cavity, is proximal the narrow wall of the cavity's collateral half with said projectile's collateral half and has surface at and that has continuous electrical continuity with said second wall conductor assembly of said cavity's collateral half via said assembly's contact means at the barrel cavity location of said aft current shunt's surface at any instant; and said first wall conductor assembly of a collateral half of said barrel's cavity has additionally, with a projectile in the barrel cavity, the first forward wall conductors of said barrel cavity's collateral half comprised of the group of one or more consecutive wall conductors of said first wall conductor assembly whose contact means at any instant have said electrical continuity with said first forward current shunt; and said first forward current shunt of a collateral half of a projectile in the barrel cavity, via said shunt's continuous electrical continuity with said narrow wall power rail and said first forward wall conductors of said cavity's collateral half, maintains continuous electrical continuity between said narrow wall power rail and said first forward wall conductors of said cavity's collateral half and, with power supplied by an outside power supply to said power rails, maintains a current path between said narrow wall power rail and said first forward wall conductors of said cavity's collateral half; and said first wall conductor assembly of a collateral half of said barrel's cavity has additionally, with a projectile in the barrel cavity, first aft wall conductors of said barrel's collateral half comprised of the group of one or more consecutive wall conductors of said first wall conductor assembly whose contact means at any instant have electrical continuity with said first aft current shunt; and said first aft current shunt of a projectile's collateral half in the barrel cavity, via said shunt's continuous electrical continuity with said aft shunt-forward shunt current bus and said first aft wall conductors of said cavity's collateral half, maintains continuous electrical continuity between said aft shunt-forward shunt current bus and said first aft wall conductors of said cavity's collateral half, and, with power supplied by an outside power supply to said power rails, maintains a current path between said aft shunt-forward shunt current bus and said first aft wall conductors of said cavity's collateral half; and said barrel bus of said first wall conductor assembly in each barrel cavity's collateral half, with a projectile in the barrel cavity, maintains continuous electrical continuity between said first forward wall conductors and said first aft wall conductors of said cavity's collateral half, and with power supplied by an outside power supply to said power rails, maintains a current path between said first forward wall conductors and first aft wall conductors of said cavity's collateral half; and said second wall conductor assembly of a collateral half of said barrel's cavity has additionally, with the projectile in the barrel cavity, the second forward wall conductors of said barrel cavity' collateral half comprised of the group of one or more consecutive wall conductors of said second wall conductor assembly whose contact means at any instant have electrical continuity with said second forward current shunt; and said second forward current shunt of a collateral half of a projectile in the barrel cavity, via said shunt's continuous electrical continuity with said aft shunt-forward shunt current bus and said second forward wall conductors of the barrel cavity's collateral half, maintains continuous electrical continuity between said aft shunt-forward shunt current bus and said second forward wall conductors and, with power supplied by an outside power supply to said power rails, maintains a current path between said aft shunt-forward shunt current bus and said second forward wall conductors; and said second wall conductor assembly of a collateral half of said barrel's cavity has additionally, with the projectile in the barrel cavity, the second aft wall conductors of said cavity's collateral half comprising the group of one or more consecutive wall conductors of said second wall conductor assembly whose contact means at any instant have electrical continuity with said second aft current shunt; and said second aft current shunt of each collateral half of said projectile in its respective cavity's collateral half, via said shunt's continuous electrical continuity with said second aft wall conductors of said barrel's collateral half and said propulsion bus-aft shunt current bus of said projectile's collateral half, maintains continuous electrical continuity between said second aft wall conductors and said propulsion bus-aft shunt current bus, and with power supplied by an outside power supply to said power rails, maintains a current path between said second aft wall conductors and said propulsion bus-aft shunt current bus; and said barrel bus of said second wall conductor assembly in each barrel cavity's collateral half, with a projectile in the barrel cavity, maintains continuous electrical continuity between the second forward wall conductors and the second aft wall conductors of said cavity's collateral half, and with power supplied by an outside power supply to said power rails, maintains a current path between said second forward wall conductors and said second aft wall conductors of said cavity's collateral half; and said aft shunt-forward shunt current bus in each collateral half of a projectile is between and connects the first aft current shunt and the second forward current shunt of said projectile's collateral half, and proximal said current shunts in said collateral half, and said aft shunt-forward shunt current bus of a projectile's collateral half in its cavity's collateral half, maintains continuous electrical continuity between said first aft wall conductors of said barrel cavity's collateral half, via the continuous electrical continuity of said wall conductors with said first aft current shunt of said projectile's collateral half, and said second forward wall conductors of said cavity's collateral half, via the continuous electrical continuity said wall conductors with said second forward current shunt of said projectile's collateral half, and with power supplied by an outside power supply to said power rails, maintains a current path between said first wall conductor assembly and said second wall conductor assembly; and said propulsion bus-aft shunt current bus in each collateral half of a projectile is between and connects the second aft current shunt and the propulsion bus of said collateral half, and is proximal said current shunts in said collateral half, and said propulsion bus-aft shunt current bus of a projectile's collateral half, when in its respective collateral half of the barrel cavity, maintains continuous electrical continuity between the propulsion bus of said projectile's collateral half and the second aft wall conductors of said barrel's collateral half, via said wall conductors continuous electrical continuity with said second aft current shunt of said projectile's collateral half, and with power supplied by an outside power supply to said power rails, maintains a current path between said propulsion bus and said second wall conductor assembly; and in which with an outside power supply attached to said power rails' connection means and a projectile in or inserted into the breech end of said barrel cavity, the electric current path in each collateral half of the gun barrel effecting electromagnetic propulsion of the projectile in the barrel cavity towards the barrel's muzzle is extant and the magnetic fields of the currents in the first and second forward wall conductors and the first and second aft wall conductors of each said barrel cavity's collateral half interacts with the current in the propulsion bus of the projectile's collateral half therein creating in said propulsion buses forces with cavity axis parallel, muzzle directed components, and the magnetic fields of the currents in the midline power rail and the barrel buses in the barrel cavity walls interact with the current in the propulsion bus in each half of a projectile in the barrel's cavity creating in each said propulsion bus forces with cavity axis parallel, muzzle directed components, and the magnetic fields of the currents in the narrow wall power rails interact with the current in the propulsion bus in each half of a projectile in the barrel cavity creating in each said propulsion bus net forces with cavity axis parallel, muzzle directed components and the above said cavity axis parallel, muzzle directed force components propel the projectile in its traverse of the barrel's cavity from breech to muzzle.
 10. Electromagnetic propulsion guns as claimed in claim 9 wherein the projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied by an outside power supply to said power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity.
 11. Electromagnetic propulsion guns as claimed in claim 9 wherein the projectile is retained at the breech end of the barrel's cavity for release and propulsion in said cavity towards the barrel muzzle on application of sufficient power to the power rails.
 12. Electromagnetic propulsion guns as claimed in claim 11 wherein the projectile is retained at the cavity's breech end by a fuse pin which: at one end is retained with electrical continuity with the midline power rail and at its other end is retained with electrical continuity with the narrow wall power rails and extends through a projectile's channel there between and with power supplied to the power rails, provides a short circuit between said power rails until vaporized and thereby freeing the projectile for traverse of the barrel's cavity. 